derailment

[dee-reyl-muhnt]
noun
1.
the act or process of derailing.

Origin:
1940–45; derail + -ment, or < French déraillement

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
derail (dɪˈreɪl)
 
vb
1.  to go or cause to go off the rails, as a train, tram, etc
 
n
2.  chiefly (US) Also called: derailer a device designed to make rolling stock or locomotives leave the rails to avoid a collision or accident
 
de'railment
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

derailment
1850, from Fr. déraillement, from dérailler "to go off the rails" (see derail).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Don't get your last word in, apologise, and end the derailment.
And let's not forget, all this really amounts to is a derailment of the
  conversation.
One was a derailment and the other was a rear-end collision.
The derailment, whose cause has not been determined, was not a rarity.
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